From c524ec0121ae70c354fa507e11880a62511d7e20 Mon Sep 17 00:00:00 2001
From: Jan Tattermusch <jtattermusch@google.com>
Date: Tue, 7 Jun 2016 16:52:53 -0700
Subject: make Metadata.Entry a class

---
 src/csharp/Grpc.Core/Metadata.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/csharp/Grpc.Core/Metadata.cs b/src/csharp/Grpc.Core/Metadata.cs
index e982fa0c48..f73f720094 100644
--- a/src/csharp/Grpc.Core/Metadata.cs
+++ b/src/csharp/Grpc.Core/Metadata.cs
@@ -95,6 +95,7 @@ namespace Grpc.Core
 
         public void Insert(int index, Metadata.Entry item)
         {
+            GrpcPreconditions.CheckNotNull(item);
             CheckWriteable();
             entries.Insert(index, item);
         }
@@ -114,6 +115,7 @@ namespace Grpc.Core
 
             set
             {
+                GrpcPreconditions.CheckNotNull(value);
                 CheckWriteable();
                 entries[index] = value;
             }
@@ -121,6 +123,7 @@ namespace Grpc.Core
 
         public void Add(Metadata.Entry item)
         {
+            GrpcPreconditions.CheckNotNull(item);
             CheckWriteable();
             entries.Add(item);
         }
@@ -187,7 +190,7 @@ namespace Grpc.Core
         /// <summary>
         /// Metadata entry
         /// </summary>
-        public struct Entry
+        public class Entry
         {
             private static readonly Encoding Encoding = Encoding.ASCII;
             private static readonly Regex ValidKeyRegex = new Regex("^[a-z0-9_-]+$");
-- 
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